MANUAL OF PATHOLOGICAL ANATOMY. 155 



or discoid nucleus, that has divided into many still adherent 

 parts, each part being itself a nucleus, and having its single 

 nucleolus. It would seem, therefore, that bodies are not porous 

 at all, but solid ; and moreover, that gold, tin, silver, lead, 

 iron, granite, and many crystals, are composed of scales, each 

 of which is a flat or discoid nucleus, divided into many still 

 adhei'ent parts, &c. ! 



Dr. Keber's views on the porosity of bodies, and his mode of 

 demonstrating it, require no comment. Any one, with a mode- 

 rately good object-glass, can of course at once satisfy himself of 

 their fallacy ; and we would merely request him, should he ever 

 see our pages, to notice that the old Florentine experiment 

 by no means proves the porosity of gold any more than does 

 the translucency of gold leaf, and that though the irregular 

 fragments of bodies which he has examined with a defective 

 instrument may exhibit the colours and appearances he 

 describes, and though some of them may present actual 

 openings of the size he mentions, it is absurd to deduce from 

 that that all bodies are pervaded by pores, in general not less 

 than l-24000th of an inch in diameter. The mere inspection 

 of such an object as a scale of Pleurosigma angulatum, for 

 instance, in which dots of infinitely less size than that can be 

 seen and measured, and yet in which no pores of any kind are 

 perceptible, is sufficient to demonstrate that all bodies are not 

 necessarily porous. Dr. Keber should also remember that 

 although some stones may imbibe water when immersed in it, 

 all do not do so any more than do metals ; though according to 

 him all are equally furnished with pores and passages of pretty 

 nearly uniform size. 



A Manual of Pathological Anatomy. By C. Handfield Jones, 

 M.D., and Edward H. Sieveking, M.D. London. Churchill. 



This will be a very acceptable volume to the medical pro- 

 fession, because we have no work embracing, in a compressed 

 form, the results of recent researches in the science of 

 pathology. Within a few years, also, the character of much 

 of our pathological anatomy has been rendered much more 

 accurate and comprehensive by the use of the microscope. 

 The authors had thus presented them a very wide field ; and if 

 we find defects in this volume, we must rather put it down to 

 the magnitude of the subject, and the necessity of bringing out 

 the work speedily, than to any want of industry and capability 

 on the part of the authors. We have to thank them that they 

 have done so much. Although the whole work is a joint pro- 



