The microscope and its revelations . tions of persulphate of iron and ferrocyanide of potassium),which, to avoid the alteration of its colour by the free alkaliof the blood, should be triturated with its own weight ofoxalic acid and a little water, and the mixture should then becombined with size, in the proportion of 146 grains of theformer to 4 oz. of the latter. 435. Injected preparations may be preserved either dry orin fluid. The former method is well suited to sections ofmany solid organs, in which the disposition Fig. 32s. of the vessels does notsustain much altera-tion by di-ying; for
The microscope and its revelations . tions of persulphate of iron and ferrocyanide of potassium),which, to avoid the alteration of its colour by the free alkaliof the blood, should be triturated with its own weight ofoxalic acid and a little water, and the mixture should then becombined with size, in the proportion of 146 grains of theformer to 4 oz. of the latter. 435. Injected preparations may be preserved either dry orin fluid. The former method is well suited to sections ofmany solid organs, in which the disposition Fig. 32s. of the vessels does notsustain much altera-tion by di-ying; for thecolours of the vesselsare displayed with freater brilliancy thany any other method,when such slices, alteibeing weU. dried, aremoistened with turpen-tine and mounted inCanada balsam. Butfor such an injection asthat shown in Fig. 328,in which the form anddisposition of the in-testinal villi would becompletely altered by drying, it is indispensable that the preparation should bemounted in fluid, in a cell deep enough to prevent any. Villi of Small Intestine of Monkey. 734 VERTEBEATED ANIMALS. pressure on its surface. Either Goadbys solution or weakspirit answers the puipose very well. 436. A well-injected preparation should have its vesselscompletely filled through every part; the particles of the colour-ing matter should be so closely compacted together, that theyshould not be distinguishable unless carefully looked-for; andthere should be no patches of pale uninjected tissue. Still,although the beauty of a specimen as a microscopic object ismuch impaired by a deficiency in the filling of its vessels, yetto the anatomist the disposition of the vessels will be asapparent when they are only filled in part, as it is when theyare fuUy distended; and imperfectly-injected capillaries arebetter seen, when thin sections are mounted as transparentobjects, than are such as have been completely filled. EiG. 329.
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