THE society's NOTE-BOOKS. 85 



part of the leaf of the entire thickness, which, after a prolonged 

 soaking in glycerine, was mounted in glycerine jelly without water. 

 It should be viewed with polarisco]je without selenite, the prism 

 being turned to give a dark ground ; it may also be viewed with 

 selenite. 



Sozodont (a tooth powder). — This will be found to consist of 

 diatoms and starch, the granules of the latter being exceedingly 

 small. 



Aspartic Acid.— When asparagin is dissolved in a saccharine 

 liquid, which is afterwards made to ferment, or when heated in 

 water under pressure in a closed vessel, or when boiled with either 

 an acid or an alkali, it is converted into ammonia and aspartic acid. 



Tingis crassicornis— syn. Dictyonota crassicornis— is one of 



the Hemiptera Heteroptera. These creatures are " in all stages 

 of their existence active and suctorial, and the consequent diffi- 

 culty of supplying them, in confinement, with fresh appropriate 

 food, few observations upon their natural history have been made 

 and recorded. There is a gradual development of the creature 

 after it leaves the egg, not only in size, but in the perfection of its 

 organs. The larva resembles the imago, and is said to cast its 

 skin three times before it reaches the pupa state ; the insect is 

 then still more like the imago ; but some of its organs — such as 

 the ocelli, wings, and claws — are either rudimentary or are barely 

 indicated, and only become perfected after the last moult. But 

 whether each species casts its skin the same number of times, how 

 long the individuals of each species remain as larva, pupa, or 

 imago, what species have more than one brood in a year, and what 

 constitutes the food of each species, are matters that in the great 

 majority of instances remain to be determined." — Douglass Scott 

 (1865). 



Prepared Cocoa. — This preparation consists of cocoa, with a 

 large addition of arrowroot and sugar. John Terry. 



Prepared Cocoa.- I wish Mr. Terry had told us luhich " pre- 

 pared cocoa " his specimen represents, for then we would give a 

 wide berth to that kind, which has so little of the nutritive bean 

 in it. This slide may give a hint to any of our members who 

 have them, to circulate some slides of Adulterations. 



A. Clarke-Smith. 



