EDUCATIONAL APPLIANCES. 1005 



tubes in two sizes for the above stands. 88. Buusen's mercury trough. 

 89. Mahogany funnel stand for two. 90. Ditto, for one. 91. Stand for eight 

 burettes. 22. Eight burettes for ditto. 93. Universal holder. 94. Two 

 Geissler's burettes for ditto. 95. Universal holder. 96. Retort for ditto. 

 97. Bunseu's universal holder. 98. Table stand. 99-102. Bunsen's burner. 

 103. Steatite ditto. 104-106. Bunsen's ditto. 107, 108. Bunsen's blast 

 burner. 109, 110. Bunsen's gas blowpipe. 111. Oxygen hydrogen burner. 

 112. Hoffmann's apparatus to show that 2 vols. of H/& 1 vol. of O. produce 

 H. 2 O. 2 vol. 113. Burette stand for ditto. 114. Ozone tube. 115. 

 . Two stands for ditto. 116-118. Chemical balance. 119. Plattner's ditto. 

 120. Set of 1 gramme weight. 121. Ditto 50 ditto. 122. Ditto 100 ditto. 

 123. Ditto 6,000 grain. 124. Ditto 100 gramme weight, common. 125. 

 Ditto 1,000 ditto. 126. Retort stand, galvanised foot. 126. Ditto, brass 

 vinos, clamp, and block. 127. Ditto, triangular foot. 128. Large retort 

 stand, two clamp burner. 129. Bunsen's apparatus for determining the 

 specific gravity of gas by effusion. 130. Glasshilig's condenser stand. 131. 

 Aug. Belsder's crucible furnace (according to Perrot, Geneva). 132. Ditto, 

 smaller (according to Forgnigum and Leslere). 133. Glasser's combustion 

 furnace. 134. Hofmann's ditto. 135. Kekuli ditto. 136. Dr. Wiirtz ditto. 

 137. Large Bunsen's burner. 138. Tripod for ditto. 139. Funnel with 

 stop-cock. 140. Set of bottles for mounting microscopic objects. 141. 5 

 decigallonjars. 142. 1,000 cc. ditto graduated jar. 143. 700 ditto. 144. 500 

 ditto. 145. 300 ditto. 146. 200 ditto. 147. 100 ditto. 148. 25 ditto. 

 149. 1,000 ditto, stop. 150. 500 ditto. 151. 300 ditto. 152. 75 ditto. 153. 

 25 ditto. 154, 155. Two cylindrical jar stops. 156, 157. Two cylindrical 

 jars, plain. 153. Hydrogen gas bottles. 159. Eprouvette. 160-162. 

 Three Woulff's bottles, assorted. 163, 164. Two Woulff's bottles. 165. 

 Oue ditto, tubulated. 166-170. Five test glasses, assorted. 171. Lixiviating 

 jar. 172-175. Four capsules. 176. Parting flasks. 177, 178. Two conical 

 beakers. 179-182. Four flasks, assorted. 183-185. Three Berlin basins. 

 186,187. Two conical flasks. 188. 750 cc. flask. 189. Set of three beakers. 

 190. Ditto four ditto, spouted. 191. Set of nine glass basins. 192. One 

 decigallon flask. 192a, 193. Two basins. 194. 250 decim flask. 195. One 

 retort. 196, 197. Two retorts. 198-200. Three receivers. 201. Bottle flasks. 

 202. Jar. 203, 204. Two specimen bottles. 205, 206. Florentine receiver. 

 207. French balloon. 208-214. Seven bottles, assorted. 215. Percolator. 

 216. Gas bottle. 217. Water bottle with tap. 218-221. Four funnels. 

 222, 223. Two spirit lamps. 224. Apparatus to prove that the mixing of 

 chlorine with hydrogen into hydrochloric acid does not alter the volume, there- 

 fore one volume of hydrogen and one volume of chlorine produce two volumes 

 of hydrochloric acid. 225. Geissler's potash bath. 226. Carbonic acid appa- 

 ratus. 227-231. Five blow-pipes. 232. Spec gear, bottle in case. 233. Mer- 

 curial trough. 234. Ditto, ditto. 235. Pestle and mortar. 236,237. Two 

 Berlin capsules. 238. Desiccating pan. 239. Porcelain plate twelve cavities. 

 240. Copper condenser and stand. 241. Complete set of apparatus according 

 to Gay Lussac for assaying silver by wet process. 242. Copper gas holder. 

 243. Vertical galvanometer for lectures. 



SOUND. 



301. Eight pieces of wood sounding the scale. 02. Opening pipe allowing 

 a view of the interior of the pedal. 303. Wertheim's apparatus, new model. 

 304. Organ pipe with glass facing, and showing vibration of sound. 305. 

 Organ pipe with changeable openings. 305 bis. Four organ pipes, all con- 

 taining the same quantity of air ; one cylindrical, one cubical, one spherical, 

 and one tetrahedral. 306. Three organ pipes, all containing the same quantity 



