i6o Chemical Ahstracts [Sept. 



The Editor of Chemical Ahstracts is assisted by two Associate 

 Editors, a staff of Assistant Editors and over three hundred Ab- 

 stractors. The ahstracts are conveniently divided into groups cover- 

 ing all branches of chemical science and industry with copious cross 

 references. The Department of Biological Chemistry, under the 

 editorship of Prof. Lafayette B. Mendel, has been particularly suc- 

 cessful and serviceable. Brief ahstracts of American, Enghsh, 

 French, and German chemical patents are included; also, titles and 

 prices of new books. 



Chemical Ahstracts is issued on the loth and 2oth of each month. 

 Although but four volumes have been published, it already has 

 by far the largest circulation of any scientific abstract Journal in 

 the World. The subscription price, to non-members of the Ameri- 

 can Chemical Society, is $6.00 per year. Foreign postage, $1.00. 



Science advances because it is never sure of anything. Duclaux. 



In experimental science it is always a mistake not to doubt 



when facts do not compel affirmation. Pasteur. 



_ Distinction is the consequence, never the ob- 



Enzymes . • ^ a 



ject, of a great mmd. Allston. 



The same force which shapes the raindrop or the molten mass 

 of a planet (surface tension) is an all-important factor in the 

 causation of vital phenomena. Macallum. 



The way to truth leads through error. All progress consists in 

 showing that the past truths were errors, or at best half-truths. 

 That does not make them superfluous ; they constitute the stages by 

 which the human mind ascends its precipitous path. Paulsen. 



Work perseveringly. Work can be made into a pleasure, and 

 alone is profitable to a man, to his country, to the world. What- 

 ever career you may embrace, look up to an exalted goal. Wor- 

 ship great men and great things. Pasteur. 



It is almost a truism to assert that the progress of knowledge 

 mainly depends on the invention of new experimental methods, or 

 the perfection of old ones. Science owes a great deal to the reason- 

 ing power of the thinker, and to the acumen of the guesser, but both 

 are alike futile until facts are accurately determined. Hallihurton. 



