156 EXTRACTS AND ABSTRACTS FROM FOREIGN JOURNALS. 



gus on all parts which might be abraded, as, for instance, the head and 

 the tail. p. 58. 



[From the Comptes Rendus, 1841.] 



On a new Process for Anatomical Injections* M. Doyere, in a letter 

 addressed to the Academy of Sciences, Paris, July 12, 1841, gives the 

 following account : I have employed for nearly two years, a very simple 

 process for obtaining fine injections. This process, which I believe 

 likely to render some service to the anatomy of structure, and probably 

 also to pathological anatomy, essentially consists in causing to enter 

 in the same vessels, within a certain interval of time, two finely fil- 

 tered saline solutions, which, by double decomposition, give an 

 abundant and opaque precipitate. This succession of two injections, 

 is that which distinguishes my process from many others tried without 

 success to obtain the injection of the capillary system by the same 

 principle. I inject the second solution, as soon as the first has passed 

 from the arterial system into the venous and lymphatic systems. 



I have tried on animals a great number of insoluble salts, with a view 

 to determine those which would give the most satisfactory results. I 

 prefer to all others the chromate of lead. I first inject the chromate of 

 potass, and am convinced that the order of injection is a point not to be 

 neglected. A blue colour may be obtained by the precipitation of 

 Prussian blue ; brilliant red by iodide of mercury ; white by the car- 

 bonate or sulphate of lead. The first has better succeeded with me than 

 the carbonates and sulphates of lime and baryta. 



The advantages which this process appears to me to possess over 

 those in use, are above all to shorten the process of making fine injec- 

 tions, and to supersede any other preparation. It may be used with equal 

 advantage cold or hot, in general or partial injection ; the materials 

 employed are unalterable, and may be consequently always ready. I 

 will add, that the most minute injections required only a pressure which 

 was evidently less than that of the heart's action. M. Poiseuille, to 

 whom I made the process known several months since, in order that he 

 might make use of it in his particular researches, has constructed an 

 instrument by the assistance of which he can inject either liquid with 

 that degree of pressure he considers proper. 



By the assistance of this process, I have more than once succeeded 

 injecting by the femoral artery in a single operation, and in a few 

 minutes, the capillaries of the muscular system in an entire animal, 

 the adipose and cellular systems of the white and grey matter of the 



* Although the priority of discovering this process, and publishing the same, are 

 decidedly due to M. Doyere, yet we must here state, that we have for upwards of 

 twelve months seen injections of the corpuscles and Haversian canals in bone, 

 the tubes on the fibre of some sponges, &c., similarly prepared by our esteemed 

 correspondent Mr. George Busk, Surgeon to the Hospital Ship, Dreadnought. 

 We can vouch for his not being acquainted with M. Doyere's process, the account 

 of which bears date July 12, 1841. Editor. 



