'534 Eixperiments cn-the Hand Granade, 



eacli other: they were found in the island Maria, which is 

 not tar from d'Entrecasteaux's channel, by Messrs. Peron 

 and Lesueur, to whom we are indebted for almost the whok 

 of the zoological riches brought to us from New Holland. 



I have comprehended in the following table all the cha- 

 racters of the genus and s-pecies of these three animals. 



HVDROMIS. 



Nat. chak. — Incisor teeth two in each jaw ; canine ; two 



molar teeth in each row, furrowed on the side, and with 



a double excavation on the crown. 



Feet pentadactyles ; the anterior free, the posterior pal- 

 mated. 



Tail round, and covered with short hair. 

 EssENT. CHAR. — Hhid-fecf palmatcd. Tail round. 



I. Species. HydrOmis coypoli. Htjdroynls cmjpus- 

 (Plate VI.) 



Hair che&tnut brown on the back, red on the flanks, and 

 bright brown under the belly. 



Coypou. Molina's Hist. Kat. tlu Chili, p. -235. French Translation. 

 hhis coypii'i. Om. Syit. Nat. 

 Quoiinn. D'Azzara, Hist, lies Quad, du Paraguay, toni ii. p. 1. 



Country. — Chili, Paraguay, Tucuman. 



II. Specieu Yellow-bellied HYDR05irs. Hydro- 

 mis chnjsogaster (Plate VIII.) 



Hair chestnut brown above, orange below. 

 Country. — One of the islands in d'Entrecasteaux's chan- 

 nel. 



III. Species. White-bellied PIydromis. Hydra- 

 mis Leucogaster . (Plate VH.) 



Hair brown above, white below, 

 CouNXKY. — The island Maria* 



L. Physico-mechanical Experiments and Dhcusslnns of the 

 Phcenomena observable in that casual Product of Art 



. the Hand Granade, Prince Rupert's Drop, or Glass 

 Tear. By Mr. John Snart, Optician. 



Although the subject of this paper is very inconsiderable 

 in itself, being, as was said above, " the casual and easy 

 product of art ;" yet as it tends, in my humble opinion, to 

 develop some very obscure and important phsenomena in 

 nature as well as the arts, I shall not take an operose route 

 to apolooize for offering my explanation of it to the public ; 

 because every accurate account of the arcana naiurce, Sec. 



is- 



