The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1879-11-13
MORE SCIENCE.
DR.. Treadwell on Blood
Corpuscles.
NICE MICROSCOPIC MEASUREMENTS.
Only Slight Traces OF Blood on
Hayden's Clothing.
New HAVEN, Conn.,. Nov. 10. 1879.


The HAYDEN trial to-day was an uninterrupted
scientific lecture and. wiha one OF the most inter
estiue of the many that been given in the court
room during the past month. 1t was on blood cor
puscies n branch of delicate scientific research IN
which very considerable progress has been maac'
The lecturer was Dr. Treadwell. of Boston, VINO Tor
five years past made the science special study
and who has been employed in numerous capitai
cases. In one respect his story was more telling
than the testimony of the experts arsenic,
for it had the moral support given by his ex-
perience in practical work in these cases
Viewed in another way, it unsatisfactory
to those who convinced OF Hayden s
guilt. The traces of blood found on the knife were
but triAes; there none the shirt which Hay
den cia ms to have the day of the tragedy,
and but few on another shirt found in his house.
and which it is believed he wore.
The defence made good point in getting before
the jury in indirect way, the States claim that
nail MARKS Hay dens brogan have been found i'm
printed ON Mary STANDARDS cheek The state OBJ
jected. and the objections were sustained put'
nevertheless, the story had gone to the twelve men,
It is rumored that the States counsel are so dis
satisfied with the testimony Of their experts ON the
heel prints that they may conclude not to introduce
it at all If they do not the defence makes the point
thar this second alleged evidence Of guilt that
the State abandons.
BLOOD coRpUscLEs
Dr. Treadwell, of Boston. recalled. testified that
FOR several years past he had devoted five or six
hours daily to the investigation of the formation
md characteristics of blood corpusces. The char
.cteristic elements. he said of blood which enable
The investigator to distinguish one kind from an
pther corpusces floating in the water OF the
blood. In the lower order they are generally oval
eliptical in form. with centre or nucleus. and
usually larger than those of the higher order-the
mammaia--which nurse their young. photo
graphs OF four specimens of blood corpusces
presented.l These photographs of the blood
OF bird. fish, snake and frog. The blood OF the
mammalia has corpuscles round in outline. They
ndented side, bi-concave. And the
Professor illustrated by pressing rubber ball be-
tween his thumb and second fnger.1 The only ex-
ception is the camel. which has oval corpuscles.
The mammals differ in the size of the corpuscles in
the long diameter. and each species has distinct
range and average of measurement in this respect.
refer to red corpuscles in all instances. The COR
puscles in the blood of would average 400 to
the inch; pig, 4.20O; sheep. $500; goat,
6300; horse and cat, 1900. These averages
hold good in the same animal different animals OF
the same species from week after birth to death.
except in the condition of the system which Is
known anemia. when the blood is not SO good as
in health. Other diseases will affect corpuscles
to numbers, but not to size. The corpuscles Of
animals cannot be distinguished from those OF
others resembling those OF the human body nre the
corpusces of the Indian elephant. the two-toed
soth the guinea pig, the whale. SEAL beaver. porcu
pine and the monkey tribe. These the same
mans. at least the differences cannot readily be
distinguished. Personally have examined only the
blood Of the beaver and porcupine.
Witness here produced tabular statement Of an
examination of various bloods. and said:-"This
shows the results of of 200 corpuscles
each of the blood of q mar dog, pig. OK, sheep
and goat. Ten individual corpuscles will givo the
average measurement Of those of the animal, and
twenty almost perfectly. The 200 measured give il
accurately. used q microscope with magnifying
power of 5000 diameters. Every corpuscle meas
ured by itself. and those possessing exactly the
same measurements were grouped. all belonging to
any particular blood being kept in the line OF
course. In the line the diagram showing man q
blood it is shown that the largest two Of Ia
OF an inch each, and two of La. S0o-of inch The
other 1876 corpusces ranged between these Sizes The
following are the extremes found
Kind of l00d Ldroesk Smallest