314 The Microscopr. 



Acknowledgements. — From E. L. Smith, M. D., Belief ontaine, 

 Ohio, photo-micrographs; from Prof. M. D. Ewell, Evanstor^, 111., 

 eye-piece micrometer scale; from Dr. J. E. Hays, Sweetsprings, Mo., 

 micro-mounts; from J. G. Meachen, Racine, Wis., mount of pollen; 

 from A. M. Hay ward, Susquehanna, Pa., mounts of chloride of gold 

 and sodium crystals; fromM. S. Wiard, New Britain, Conn., diatoms 

 from Peruvian guano. 



It is with great regret that we announce the death of Dr. E. P. 

 Howland, of Washington, D. C, a man full of genius, but who, to 

 use the language of a friend, "never got much credit for it." 



Dr. Howland made some excellent improvements in methods of 

 handling both calcium and electric light. At the last meeting of 

 the Washington Microscopical Society, a few evenings since, a 

 committee was appointed, consisting of Drs. Thos. Taylor and 

 Reyburn, to draw up resolutions lamenting the loss of Dr. How- 

 land, to be submitted to the Society at the next meeting. At the 

 recent meeting at Cleveland of the A. A. A. S., Dr. Howland exhib- 

 ited for the members many objects of interest, on the screen, with 

 electric light. 



TECHNOLOGY 



DEVICE FOR CUTTING OUT LANTERN SLIDE MATS. 



TOS. p. BEACH, in The Universal Tinker: My method con- 

 *^ sists in taking a block of hard mahogany, apple-tree or pear- 

 tree wood, with the end grain upward, and about an inch and 

 a quarter thick, and as large in size as an ordinary lantern slide 

 plate, and marking on the surface with a lead pencil the 

 form and size of the mat wanted, but perhaps a little smaller 

 than an actual size. Then, with proper tools, chisels and files, I 

 take off the block, a half inch in depth, the wood, until it assumes 

 the oval or square marked out, I back up the mahogany block with 

 half an inch of a softer kind of wood, securing it by screws, and bore 

 a hole through the center, three-eighths of an inch in diameter. 

 This permits the air to reach the center. Around the wood form 

 thus made, I bend an ordinary clock spring, which can be bought 

 very cheaply, and is usually about three-quarters of an inch wide, 

 and secure it to the wood by screws. I prefer to do this with the 



