APPENDIX. 887 



cover in such manner Lliat all people are accommodated above the 

 water line, and the whole of the bowels of the ship are given up to 

 engine, coal, and stores ; a fair division of the cabin space is allotted to 

 each person, and the berths are made movable, so as to remove any 

 ice that may form against the cold sides of the ship. Drying room, 

 bath room, closets, instrument room, photographer's dark room, and 

 dispensary are all in convenient position and roomy. Cook house for 

 officers and crew, and pantries to suit, are all arranged on the spar deck. 

 Provisions are stowed forward, coal amidship, clothing and fine stores 

 aft. Compound engine and boilers of the most approved type to be 

 fitted. General dimensions of ship from flank ends forward to for- 

 ward rabbet of stern post 140 feet on water line, 38 feet beam, 12 feet 

 draft. All of the foregoing requirements are fitted in the ship in ques- 

 tion, and fully set forth in the drawings. 



APPENDIX G. {See page 657 '.) 



Some Remarks of Dr. Ambler on Snow Crystals, etc. 



After an experience of two seasons in the Arctic, I have no hesi 

 tation in saying that the variety of snow formations is as numerous, 

 if not more so, than in more temperate climates. Without having 

 made any special study of snow crystals I have been in the habit of 

 observing them for years, and I can fairly presume that I am as famil- 

 iar with the different formations as are most people. For some time 

 past I have paid especial attention to the subject, and have found 

 myself fully repaid for the trouble. 



I will endeavor to give as clear a description as possible of what I 

 have seen, and for the accuracy of which I will vouch ; and will 

 undertake to show any one accustomed to the use of a microscope. 

 As for the deductions I make from the premises they must stand or 

 fall on their own merits. 



It is not necessary for me to point out the well-known utility of the 

 hexagon in pattern drawing, but to the fact that water crystallizes in 

 this system may be ascribed all the beauty and variety of the snow- 

 flower. 



The basic water crystal is the right hexagonal prism ; the hexag- 

 onal pyramid occurs less frequently, the prism most often ending 

 abruptly in an hexagonal plane, but sometimes being complimented by 

 the adhesion of the pyramid. The length of the prism varies from 



