of fixed stop, and the tiino required for the air bubble tc tnrvcrsu tlic fluid, or a incnsurecl portion thcrcof, is dcter mical. Tho velocity of tho air bubblo in cm. or mm per second affords a inwiiiu of tho vimsityof thc oil ctc. Tho viscosity iiictcr niny nlao lm providal wit) Rdjurteblo lcga, RO that tho zero mark inny bc m d o lovo uvcn when tlic appiatiis rcsts upon nn I I I I C ~C I I ~urface. -c. A. nr. Coloriritetcr. A. 11. Parks, Philndclphin, Pa. U.S. Pat. 977,964, Dec. (I, 1910. -1'0~. I. (Pnrt 11.) G u s . BERSIIARD JICLLER. Pricc bI. 4. CONTAMS 103 gcs of subject mnttcr with 19 illustrations.
Tho text is su&vided as follows : --1. Dcfinitiou of glass. 11. Ite history. 111. Exports nnd inilmrts. Glass in Germany. Statistics. IV. Conipsition. V. Propcrties. VI. lhterinls nnd niixturcs. Melting resscls and furnaces. VII. Pusion process. VIII. Prclmring tho glnw niclt, ctc. TX. Glnas colouring, etc. X. hlcchanicnl procosscs. A. Cutting and polisliing, ctc. I ) . Etchiug: XI. \Voter-, &SZEL&&IFTEN ZUR CllEX~SCILEN; TECIISOLOOIE IIER-, I. PREPARATIOS O F I'APER, (i.) The fibre Inaterink: glass. LEATHER. J O I i A S S E S PAESSLER. FORMS pnrt of thc mint issuo 11s precccling, nnd conbins 13 pngcs of subject mnttcr, with 2 illustrations, atid deals with tlic following subjccts :-I. Introduction. 11. Crudc innterials and adjuncts of thc tanning industry. LI. Tlic tunning ~K I C C H S , and its tlctils. VOL. I. (Part 111.). PATS, O m , \VAXES, otc. C. STIEPEL. Pricc 31. 8. TIIIS, purt 111. of tho scrics, contains 138 pnges of subject matter. with 22 illustraticuis, nud an alplinbcticnl iridox of subjccts in all tho tlirco p ~x d i n g issues, i.c. Parts I. to 111. Tho subject inutter of tho prcscnt pnrt HI., is sub-diritlcul as follotw :-I. Occurrencc of fnttl, oib, arid waxes. 11. Alctliods of crtracti~ig fnts, oil. and nnxes. 111. Thcir purification. IV. Tho continercinlly wost ituportatit fats, oils, trud ,nscs nnd tlic tcclinicnl nlcthods of. extracting and prcpnring tliciii ; Their ~iroprtics, and valuation. V. Tho coinuiarciul vnluution. and final purification of fats aid oils. V1. Sonp ninriufacttrre. VII. Glycerin innnufncture.