328 Dr George Buist on the 



where the expelled ovisac is probably absorbed. I have 

 shewn a corresponding vesicle to be common to the other 

 Vertebrata, and I am by no means disposed to limit the ovisac 

 to this class of animals, believing it to correspond to the 

 " schaalenhaut" of German authors in the lower ones. Its 

 final destiny in different animals may be very different. But 

 analogy forbids the supposition that, exist where it may, the 

 ovisac in any two animals essentially differs in its relations to 

 what may be present of a vascular covering. It is equally 

 improbable that while the ovisac is expelled from the ovary 

 in Mammalia, it remains in that organ elsewhere. 



The Physical Geography of Hindostan. ByDr Geo. Buist, 

 Bombay. Communicated by the Author. 



General Description. — Our recent conquests have extended 

 our north-west frontier to almost everywhere beyond the 

 Indus, and the British dominions now stretch from the sea 

 to the mountains, all around from Soonmayance in Scinde 

 to Arracan in Burmah ; and the region to which the follow- 

 ing remarks pertain is the same in its physical as its political 

 boundaries and area. It forms a vast irregular lozenge, com- 

 posed of two triangles, one of them nearly equilateral, resting 

 on opposite sides of the 22d parallel. The peninsula of Hin- 

 dostan proper — of about 1200 miles each side, extending 

 from the latitude of Cutch and Calcutta, and so southward to 

 Ceylon, in latitude 7° — constitutes the southernmost of these 

 and is bounded to the south-east and south-west by the Bay 

 of Bengal and the Arabian Sea ; the other, which rests on 

 this, base to base, is obtuse-angled and scalene, its apex 

 reaching north beyond Attock, and its base extending along 

 the shores of Scinde to Cape Monze, and those of the Bay of 

 Bengal to the mountains eastward of Chittagong, or from 

 the 67th to the 90th eastern meridian. It comprises an area of 

 1,309,200 square miles, surrounded by a boundary of 11,260, 

 or one-half the circuit of the globe. Of these square miles 

 S00/788 belong to England, 508,412 to native states. 



The features of this vast country are almost endlessly di- 

 versified. A huge range of mountains walls it in on the north- 



