Sentence:  From the 136 pages of the book, not less than 84 are devoted to chemical physics, of which certain parts are treated elementary, while in the whole and for the reason just stated, most pharmaceutical students outside of the reach of Prof. Curtman's masterly instruction, will have to resort for this kind of instruction to more explicit textbooks, before they can derive much  benefit from a <WSD>Repetitorium</WSD>, which in this particular, reaches above the knowledge of the average student. 
Meaning of the word marked with <WSD> tags:  review text