216 Objects JOT the Microscope. 



CHAPTER XV. 



ANATOMICAL INJECTED PREPARATIONS. 



THESE beautiful and instructive preparations will he 

 found most suitable objects for examination with a binocular 

 microscope ; and as this little hand-book is intended for the 

 non-medical and young students of Natural History, a 

 description of the usual preparations shall be as brief and 

 clear as possible. 



If the structure of a Bee's tongue, or of a Cricket's 

 gizzard, be interesting to us, and the spiracle of a Beetle 

 and egg of a Fly be worthy of a place in our cabinet, much 

 more so must be those organs of our own life upon whicli 

 our health of body or of mind depends, and which in their 

 elaborate workmanship and forethought prove how fearfully 

 and wonderfully we are made. It is not a merely curious 

 study, for if we did understand the mechanism of our body 

 better we should not so recklessly peril its safety, by the 

 careless folly of fashion or the unbridling of our passions. 



INJECTED PREPARATIONS 

 Of Human Liver Rabbit Pig Monkey, &c. 



These are either injected with chromate of lead,^ver- 

 million, or, if for transparent injections, with Prussian blue 

 and carmine. The sections give the lobular and inter- 

 lobular vessels, sometimes the blood-vessels only, or the 

 interweaving capillaries and hepatic vessels in different 

 colours. 



The preparation before me of Sheep's liver is one of 

 Topping's, presenting a beautiful series of radiating, minute 

 vessels, in a mingled network of blue and carmine ; the 

 stereoscopic effect detaches every capillary, and we look 

 through the delicate structure. 



