. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. MICROSCOPE. 347 être trouvés bien supérieure à toute forme de couteaux pour couper à travers les tissus délicats sans les déranger. Swammerdam est dit avoir fait beaucoup d'utilisation de ces outils, dans ses structures d'insectes de dissections, qui, à partir des comptes d'entre eux, semblent presque d'avoir surpassé tout ce qui depuis ont été exécutés. Le forceps courbe recom- mandé par M. Slack, nous avons également utilisé avec beaucoup d'avantages. Pour plus de minute nous recommandons fortement la dissection peut commun aiguilles, et met en œuvre de coupe qui peut être

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MICROSCOPE. 347 be found much superior to any form of knives for cutting through delicate tissues without disturbing them. Swammerdam is said to have made great use of such implements, in his dissections of insect structures, which, from the accounts of them on record, seem almost to have surpassed any which have been since executed. The curved forceps recom- mended by Mr. Slack, we also have used with much advantage. For more minute dissection we can strongly recommend common needles, and cutting implements which may be easily manufactured from them, by grinding down their sides upon a hone. These may either be fixed in wooden handles, or, which is much better, held in little instruments resembling crayon-holders, specially constructed for their reception. The dissector is thus enabled to give to his needle the effect of a long elastic point or of a short stiff one, by simply altering the part at which it is held. In the ivory handles of these holders, also, there is a receptacle for the needles, which makes the whole of this useful little apparatus complete in itself.* Many microscopists, especially on the conti- nent, are in the habit of making great use of the compressorium, an instrument in which an ob- ject may be submitted to graduated pressure between two plates of glass, the parallelism of which is perfectly maintained. The results obtained by such compression, however, must be accepted with great caution, and need to be corrected by those views of the object which are gained without that distortion of it to which it is liable in this method. The class of inves- tigations in which the compressorium is most valuable, is that in which such structures as the minute ovum need to be closely scrutinized, without any further change in their shape than may render their contents more distinctly visi- ble. For such purposes we believe that a steady hand and a well-made aquatic box will answer

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