CONTENTS. XXVll 



PAGE 



Houston's Botanical Dissecting Ificroscope. (F/gr. 116) .. Part 3 513 



Jauberfs Microscope. (Fig. Ill) „ 514 



V^riclis Skin Microscope. (Fig.WS) „ 516 



Watson's Microscope- Stand. (F/^. 119) „ 516 



Eye-Shade for Monoculars. {Fig. 12Q) „ 518 



Diagonal Rack-work and Spiral Pinion. {Fig.VlY) , 518 



New Fine Adjustment „ 519 



Oil-immersion Objectives with Correction Adjustment . . „ 519 



Seller s Large Stage „ 520 



Sliding Stage Diaphragms. (Fig. 122) „ 520 



JBousfield's -Rotating Diaphragm-plate. (Fig. 123) .. .. „ 528 

 Hyde's Illuminator or Oblique Immersion Condenser. 



(Figs. I2i and l^b) „ 524 



High Magnifying Power „ 525 



Graham's Compressorium. (Fig. 126) „ 525 



Insect Cage. (Fig. 127) „ 526 



The Essence of Homogeneous Immersion „ 526 



Abbe's Apparatus for demonstrating the Increase of 

 Badiation in Media of higher Eefractive Index than Air. 



(Fig.128) „ 526 



Deby's Improved Grovdng -slide. (Fig. 129) „ 527 



Test for Illumination. (Fig. 134) „ 541 



Society Standard Screw ,, 547 



Ahrens's Erecting Binocular Microscope. (Figs.looandlZQ') Part 4 651 

 Crossley's Microscope v:ith Special Arrangement for Illu- 

 minating the Sv:inging Suhstage. (Figs. HI audits) .. „ 653 



Griffith Chih Microscope „ 655 



Parkes's Child's Portable Compound Microscope. (Fig. 139) „ 655 



Silk-Mercer's Microscope. (Fig. I'kO) ,, 656 



Sidle' s No. 4: " Acme" Microscope. (Fig. HI) „ 657 



Baker's Student's Stephenson's Erecting Binocular Micro- 

 scope. (Fig.U2) „ 658 



Yerick's Dissecting Microscope. (Fig. US) ■. „ 659 



Guvdlach's '■^ Periscopic" Eye-pieces ' .. .. „ 659 



Nachet's Objective Carrier. (Figs, l^ii and 14b) .. .. „ 661 



Verick's Objective " Extractor." (Fig. 146) „ 662 



Sliding Objectives „ 662 



Smith's Object Plate and Finder. (Figs. HI and 148) .. „ 663 



Wenham's Disk Illuminator. (Figs. 14^ and IbQ) .. .. „ 664 



Smith's ^^ V-shaped Diaphragm." (Fig. 151) „ 665 



Value of Stringing Substages ,, 666 



Botterill's Life-slide. (Fig. 152) „ 669 



Botterill's Life-trough ,, 669 



Hardy's Vivarium. (Fig. 153) „ 671 



Simple Growing-slide „ 671 



Wight's Growing-slide „ 672 



Bartley's Warm-stage. (Fig, 154) „ 672 



Hume's Frog-plate. (Fig. 155) „ 672 



Apparatus for Investigating Capillary Blood-pressure (in the 



Frog's Foot). (Figs. 156-159) „ 674 



Sogers' s Micrometers „ 678 



