90 



campholytic acids. This furnishes (juite conclusive proof that the formula for 

 ■camphor proposed by Armstrong* is not correct. 



rcH3 1. 



The preparation of the acid, C b Hg -^ CO, H 2. has l)een undertaken and 



I CH; 3.7 



by a study of its derivatives it is hoped to secure proof of the truth or falsity of 



CoUie'st formula for camphoric acid. 



Note on Milk IxsrECTfON. By Geo. W. Benton. 



The milk supply of cities is becoming a matter of scientific interest. Formerly 

 milk sophistication consisted of skimming or watering or both. More recently 

 various well authenticated rumors of the employment of chemists in the prepara- 

 tion of adulterants, and the marketing of prej)arations which enables the creamery 

 to substitute foreign fats for milk fats have caused increased attention and greater 

 care in their examination. The inspector, devoid of scientific skill, relies upon 

 the lactoscope, the lactometer, the hydrometer and the Babcock machine, instru- 

 ments sufficiently accurate and reliable for the cases of skimming and watering 

 for which they were made, but entirely unreliable when taken alone in the detec- 

 tion of the preparations made by chemists for the express purpose of deceiving 

 those using the instruments. 



In my two years' experience in the work of milk analysis, abundant evidence 

 ot the untrustworthiness of ordinary inspection came to my notice. Besides the 

 watered and skimmed milk, samples of pure cream, common herd and Jersey 

 milk, were passed upon and pronounced suspicious by the ordinary methods in 

 the hands of the inspector. And, finally, it became necessary, in view of the fab- 

 rications employed, to do away with such tests, and subject everything to a more 

 searching examination, as the only sure way to get at the truth. 



A c ise in j^oint came under my observation in December, 1892, as follows: 



An inspector brought in a sample of milk which, by his testing instruments, 

 gave evidence of being rich, but the appearance, on close examination, was not in 

 strict conformity with the other indications, and he submitted it for analysis. 

 Re-!ults attained were as follows, the data taken from my notes made at the time : 



A careful physical examination showed the milk to be abnormally thick for 

 milk, but not for cream. A portion, on standing several hours, failed to show a 



*'Ber. d. Cliem. Ges. (16, 2260.) 

 tlbid.25,1116. 



