sou, these boats might be applicable to 

 the saving of lives, under Ihc most in. 

 teiesting of circumstances. 



Nature of Blood. — Microscopic 



78 Spirit of Philosophical Discovtri;. [Feb. 1, 



trtllis grating,on which the branches are 

 truined, and an agreeable facility is 

 oll'ered for selecting and gathering 

 this fruit. 



The Hamhwy Ice Boat, for receiving observations on the thin and seinidia- 



droimiinrf ptrsons, where the ice has phanous parts of living animals, have 



•broken and let Ihem into the water, is shown that liieir blood during life, is 



described in the Mechanic's Magazine, merely serum, holding in suspension 



NoilO; it is made extremely lijfht, of numerous particles which owe their 



strong basket-work, covered by pre- red colour to a membrane in which 



pared leather or oilod cloth, having two they are inclosed ; but which particles 



keels rather widely separated, each are within of a colourless substance, 



furnished beneath with thin bars of very closely allied to albumen. Messrs. 



hard m ood, or else metal, on which the Provost and Dumas have lately made, 



boat can be safely sledged or slid and published in the Ann. du Chimie, 



along, either on land or on ice; be- an e.t tensive scries of observations on 



tween the keels, a long square or an blood, very recently drawn from man, 



oval hole is left in the centre of tiie and a great variety of animals, birds, 



boat's bottom, and the basket-work and fish ; from whence they conclude. 



turned up around the same, and also 

 the water-tight leather or cloth cover 

 V ithiu it, to the height of the gunwale, 

 so as to form a tight bottomless well- 

 Iiole in the centre of the gravity of the 



1st. That arterial blood contains more 

 parJicles than venous blood. 



2(1. That the blood of birds is the most 

 abundant in particles. 



3d, Tliat the mammiferse succeed bird? 



boat. 'I'his boat, carefully preserved, in this respect, and the blood of the carni 

 and kept standing on its keels near vorcn.s tribes contains more particles than 

 to places of danger, is furnislit d with a ^^^^ of the herbivorie. 



coil of strong line aud a drag, and with 

 a pairof long tongs or forceps, for em- 

 bracing and pulling up a body, its furni- 

 ture being so stowed therein as exactly 

 to balance the boats on an horizontal po- 

 si tion,wh en suspended from tw<fi!!mdles 

 on the top of the sides of the well-hole, 

 connected below by straps with the 



4tli. That the coUl-bloodcd animals pos- 

 »e,«s the smallest particles. 



Lastty. That after an animal has been 

 somewhat exhausted by acopioiis bleeding, 

 its veins suddenly absorb sernni from the 

 parts which snrroinid them, so as nearly to 

 su;)ply the loss of blood, as to quantity ; 

 but wliereiu a prajjortionably dimi- 

 nislipd ULiiibcr of particles is of course 



keels. On any emergency a man jumps found, 

 into the well-hole, and catching up the — In the coarse of these experiments, 

 boat by its handles (the height of whicli on 10,000 parts by weight of fresli 

 is adjustable to the man's height,) he blood, in each case, first drawn, that 

 walks forward, carrying the boat across from the com»on hen was found to 

 the land aud on to, and across the ice, contain the greatest weight of particles, 

 until it is launched in the broken part, viz. 1571 parts; the barbot (or gadus 

 over or near to the sufferers; a strong lota) the least, or only 481 parts ; and 

 loose strap across the well-hole is pro- the average weight of particles in th^ 

 vided, across which the man straddles, 20 species of beings experimented 

 to secure him from danger of sinking upon, was 1125; and the human parti- 

 through the well-hole into the water, cles 1292. The average number of 

 on the boat's floating, and before ho respirations usually made per minute 

 can have time, by resting his hands on by the animals experimented upon, was 

 the handles, to throw his legs out of something under 27; the extremes in 

 the well-hole, and take his standing or this respect were the guinea-pig, and 

 seat in the boat, and proceed to take tare, each 36, and the horse 16, 

 in or search for the drowning persons, amongst the animals not torpid ; whilst 

 If the distance on land is considerable, the human respirations were 18 per 

 ahorse or men can drag the boat on minute. The average number of pul» 

 its sledge keels, and the boatman sations per minute was something more 



only takes his station in the well-hole, 

 at the edge of the ice. We hope and 

 trust that our parks, the scene most 

 winters of dire distress from dangers 



than 111; those of the heron being 

 200, of the horse only oG, and of maa 

 72. The average heat of the blood, 

 102i° of Far. (very nearly that of 



of drowning, may. be each furnished man's, 102-3°) the duck risiug to 108P, 

 with ice-boats,as much improved upon, and the ape only to 95-9°. 

 as British ingenuity may be able. In Mr. John Murray, in some Obser- 

 oases of attempted suicide at any sva- vations ot,\ the light and himinotis 



matter 



