The microscope and its revelations . use 716 324. Cartilage of Tadpole, after Schwann 717 325. Striated Muscular Fibre 720 326. Ultimate fibriUsB of Ditto 721 327. CapiUaiT Circulation in Web of Frogs foot, after Wagner . 728 328. Intestinal villi of Monkey 733 329. Various fonns of Capillary network, after Berres .... 734 330. Portion of GiU of J^e? 735 331. Interior of Lmig of Frog 736 332. Section of Lung of Fotvl 737 333. Section of Human Lung 738 334. Microscopic organisms in Levant Mud, after Williamson . , 714 335. Ditto in Chalk from Gravesend, after Ehrenberg . 745 336. Ditto Ditto fr
The microscope and its revelations . use 716 324. Cartilage of Tadpole, after Schwann 717 325. Striated Muscular Fibre 720 326. Ultimate fibriUsB of Ditto 721 327. CapiUaiT Circulation in Web of Frogs foot, after Wagner . 728 328. Intestinal villi of Monkey 733 329. Various fonns of Capillary network, after Berres .... 734 330. Portion of GiU of J^e? 735 331. Interior of Lmig of Frog 736 332. Section of Lung of Fotvl 737 333. Section of Human Lung 738 334. Microscopic organisms in Levant Mud, after Williamson . , 714 335. Ditto in Chalk from Gravesend, after Ehrenberg . 745 336. Ditto Ditto from Meudon, Ditto . 746 337. Vertical section of Nummulite 750 338. Portion of Ditto, more highly magnified 751 339. Horizontal section of Ditto 752 340. Section of Orhitoides Frattii parallel to its surface . . .753 341. Portions of Ditto, more highly magnified 754 342. Vertical section of Ditto 754 343. Eye of TriloLite, after Buckland 757 344. Section of Tooth of Lahyrinthodon, after Owen , . .758 345. Crystallized SUver 762. No one who attentively examines the progress of anydepartment of Science, save such as are (like Mathematicsor Metaphysics) of a purely abstract character, can fail toperceive how much it is dependent upon the perfection of itsinstmments. There are few instances, in fact, in which theinvention of a new instrument, or the improvement of an oldone, has not given a fresh stimulus to investigation; evenwhere it has done no more than afford that degree of precisionto the results of enquiries already in progress, which alonecould enable them to be made available as data for philo-sophical reasoning. But ther-e are many cases in which suchinventions or improvements have opened-out entirely newpaths of scientific research, leading to fertile fields of investi-gation whose very existence had been previously unknown, torich mines of discovery whose treasures had lain uncared-forbecause entirely unsuspected.—A few examples of tliis generaltruth may not be inappro
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