January 7, 191 5] 



NATURE 



523 



With regard to hybrids. Prof. Henry, by historical 

 research and experiment, has established the fact that 

 many fast-growing trees in cultivation as the Lucombe 

 Oak, Common Lime, Cricket Bat Willow, Black 

 Italian Poplar, etc., are hybrids. By artificial pollina- 

 tion (Fig. 3) he has succeeded in raising new hybrids. 



j they are here reprinted by permission of the Board 

 j of Trade, 



j Imports of Scientific Instruments and Apparatus 



AND P.^RTS into THE UNITED KINGDOM IN I9I3- 



: Extracted from the "Annual Statement of Trade 

 of the United Kingdom." 



I Scientific Instruments and Apparatus {other than 

 I Electrical) Complete. 



Total imports ... 



Of which from Germany 

 Belgium 

 France 

 Switzerland 

 U.S.A. ... 



£ 



710,341 

 362,891 



28,939 

 108,040 



19,872 

 182,293 



Parts thereof {including Kinematograph Films, 

 Photographic Plates, and Films and Sensitised Photo- 

 graphic Paper). 



Total imports ... 



Of which from Germany 

 Belgium 

 France 

 Switzerland 

 Italv ... 

 U.S.A. ... 



£ 



^.373,426 

 310,229 

 126,725 

 522,682 

 28,762 

 121,842 

 1,256,311 



Fig. 3. — Cross-fertiliFing a walnut tree. The bags are on the 

 branches above and to the le(t of the operator. 



which display the extraordinary vigour characteristic 

 of the first generation cross ; and in his paper gives 

 an account of these. The most notable so far are 

 a new hybrid Poplar {Populus generosa) and crosses 

 between the Common Ash and American species of 

 Fraxinus. 



OPTICAL GLASS AND SCIEXTIFIC IXSTRU- 

 MEXTS: UXITED KIXGDOM IMPORTS 

 AND GERM AX EXPORTS. 



T N reply to a request for information upon the sub- 

 -^ ject of imports of optical glass and scientific 

 instruments from Germany and elsewhere, the Com- 

 mercial Intelligence Branch of the Board of Trade 

 has favoured us with a statement showing the imports 

 of scientific instruments and apparatus and parts into 

 the United Kingdom in 1913, distinguishing principal 

 countries whence consigned. We have received, in 

 addition, a statement of the German exports of optical 

 ^lass and glass instruments in 1912, distinguishing, 

 rJer alia, the exports to the United Kingdom, as well 

 as particulars of the exports from Germanv to the 

 United Kingdom in 1912 of other scientific instru- 

 ments. As these particulars are of interest and im- 

 portance at the present time, in connection with 

 efforts being made to provide for increased supplies 

 of optical and chemical glass and scientific instruments 

 from manufacturers in the United Kingdom, 



NO. 2358, VOL. 94] 



Exports of Scientific Instru.ments (other than 



Glass) fro.m Ger.manv to the United Kingdom in 



1912. Extracted from the Offici.al German Trade 



Returns. 



Optical measuring instruments 

 (polariscopes, etc.) nautical com- 

 passes, astronomic telescopes, 

 and other astronomic, geodetic, 

 nautical, etc., instruments 



Pedometers, pocket instruments 

 for recording, etc., automatic 

 measuring and registering appa- 

 ratus, speed indicators, auto- 

 matic balances, etc. 



Cases of geometrical instruments, 

 ruling pens, mathematical in- 

 struments, etc. 



Calculating machines 



Surgical instruments 



Precision balances, instruments for 

 metrology and gauging baro- 

 metric, calorimetric, thermo- 

 metric, and chemical instruments 



Physical teaching apparatus 



100 kilogs 

 87 



1,991 



94 

 472 



453 

 75 



Marks 

 317,000 



1,222,000 



167,000 

 173,000 

 766,000 



402,000 

 67,000 



100 kilogs. = 220-46 lb. Mark=ii-8J. 



Exports of Optical Gl-^ss and Gl.\ss Instruments 



in 1912, distingu^sh1ng principal destinations. 



Extracted from the Offici.al Gersian Trade 



Returns. 



