AGRICULTURAL EXPERIMENT STATION. 195 



journey ; otherwise they generally die on the road and shrivel up. 

 Send as full an account as possible of the habits of the insect respect- 

 ing which you desire information ; for example, what plant or plants 

 it infests, whether it destroys the leaves, the buds, the twiu;s. or the 

 stem ; how long it has been known to 3'()u ; what amount of damage 

 it has done, etc. Such particulars are often not onl^- of high scientific 

 •interest, but of great practical importance. In sending soft insects 

 or larvae that have been killed in alcohol, they should be packed in 

 cotton saturated with alcohol. In sending pinned or mounted insects, 

 always pin them securely in a bos to bj inclosed in a larger box, the 

 space between the two boxes to be packed with som 3 soft or elastic 

 material, to prevent too violent jarring. Packages should be 

 MARKED WITH THE NAME OF THE SENDER, and addressed to the ento- 

 mologist for the Experiment Station, Orono, Me. 



ANALYTICAL AND EXPERIMENTAL METHODS. 

 Protein Digestion.* 



UIOESTIBrLTTY OF THE PROTEIN WITH ARTIFICIAL SOLUTIONS. 



The methods employed in the artificial digestion experiments 

 were essentially those finally proposed by Stutzer, viz : the diges- 

 tion ot the finely ground substance for twenty-four hourrf in an acid 

 pepsin solution at 40° C, followed by digestion with a solution of 

 pancreas for the same time at the same temperature. 



The variations in the methods were the use of scale pepsin instead 

 ot" an extract from the inner membrane of a pig's stumach, the 

 pieparaiiuii of the pancreas solution in the way proposed by Dr. 

 Chittenden, and in the case of the foddeis from XXIX to 41 the 

 digestion with pancreas for only twelve hours. 



*PrinteJ in advanCi nearly as given here in Agricultural Science November, 18S6. 



