284 ANATOMY OF THE RABBIT. 
A convenient method of making up the fluid, especially when 
embalming the animals in numbers, is to prepare the mixture of 
formalin, carbolic acid and glycerin as a stock-solution, to be 
diluted for use by adding to each part of stock 6 parts of water. 
The amount required varies according to the size of the animal, the 
flow of the fluid in the vessels, the length of time during which the 
animal is left under the action of the fluid, and the height of the 
pressure column. Not less than 1500 cc. should be allowed for each 
specimen. 
The apparatus needed for embalming includes a reservoir for the 
fluid, provided with an exit pipe to which a rubber tube may be 
attached; about 6 feet of rubber tubing to connect with the operat- 
ing table; several three-way pieces to divide the stream in case 
several specimens are to be handled at the same time; selected 
rubber tubing of the size indicated below to attach the cannulae; 
clamps for the tubing; and, finally, glass or metal cannulae for 
insertion into the femoral artery. 
Glass cannulae suitable for the purpose are readily made by 
heating ordinary glass tubing over the Bunsen flame and drawing 
it out to the desired thinness. The tubing used for the purpose 
should be of about 6 mm. outside diameter. The cannula when com- 
pleted should be about 7 cm. long; and its narrow end should have 
a uniform diameter of 1.5-2 mm. for about 2 cm. at the tip. The 
tip should be touched lightly in the flame in order to round the 
margin by fusion, otherwise it might damage the wall of the 
vessel. 
The rubber tubing used to connect the cannula with the main 
tube should be of the best quality of soft rubber, and should have 
an inside diameter of 4 mm., i.e., of proper size to slip on and off 
the cannula easily, but yet to retain its hold on the latter under 
moderate pressure. 
The reservoir for holding the embalming fluid may be an aspir- 
ator or irrigator bottle, an enamel fountain, percolator or ordinary 
funnel. It may have a capacity of one or two quarts. The 
capacity, however, is immaterial, so long as the operator keeps 
the fluid replaced. The reservoir is suspended in such a way that 
it may be moved up and down within a distance of four feet above 
the top of the operating table. 
