152 THE AMERICAN MONTHLY [May, 



fig. 3 is from an " active one," both are copied from the 

 standard text-books for comparison with the fig. 1. 



The large intestine is a tubular organ of larger diam- 

 eter than the small intestine, it presents the usual three 

 coats in the usual order. The mucous coat is the only 

 one which requires special mention, that is composed of 

 broad and short tubular glands, much like those of the 

 small intestine which are called the "crypts of Lieber- 

 kuehn." There are no villi. A student who has mas- 

 tered the structure of the stomach and small intestine 

 will find it an easy matter to interpret his sections of the 

 large intestine. 

 Biological Laboratoky of Hamline University. 

 Feb. 17, 1894. 



The Aniline Stains. 



By smith ELY JELLIFFE, M. D. 



BROOKLYN, N. Y. 



The use of the aniline stains for histological and patho- 

 logical work for both plant and animal tissue is daily 

 increasing, and almost as soon as commercial enterprise 

 has evolved a new dye stuff for domestic use, the work- 

 ers in microscopical lines have seized upon it and the re- 

 sults are soon found in the various journals. 



There has been or are still a number of difficulties in the 

 way of procuring these stains, and many times the en- 

 deavor of the microscopist to corroborate the results of 

 other investigations fails. The reasons are not far to 

 find : Many times it is the unscrupulous clerk who pen- 

 cils upon the bottle Acid Fuchsin, when it should be 

 Fuchsin ; or Methylen Blue, when the original is Methyl 

 Blue ; and unless the investigator is aware of the differ- 

 ences the results are not satisfactory. Again it is the 

 fault of the original investigator who describes the use 

 of Orange, in watery solution, not mindful of the fact 

 that there are ten to twenty Orange preparations in the 

 market. 



