56 



BOTANICAL GAZETTE. [ Maixh r 



On the single assumption that there exist " gemmules " in 

 Darwin s sense of the word, and that these are transmitted by 

 cell-division through all parts of the system, it still remains 

 possible -to connect under one point of view several grand 

 classes of tacts," of which the principal are: all forms of 

 asexual and sexual reproduction, heredity, variability, rever- 

 sion, regrowth of amputated parts, and development of or- 

 ganisms in all its forms, whether normal or abnormal 



Darwin s pangenesis, notwithstanding its usefulness and 

 simplicity, has been exposed to many misunderstandings, 

 and this may partly be attributed to the great stress laid ly 



he £rt°thT£ *♦* mi 2 rationof gemmules; partly also to 

 rhoin T 5 rt ? !> emmul es" itself was not happily 



in X mn, iaS CGrtainly ^? en misint erpreted by some authors 

 d. of r aCC ° UntabI f manner ^nd as, moreover, the 



idea of wandering particles is closely connected with it 



devIlon S menf ??' "V^ 'T** The P** cl **> t0 whic h the 



developmen of hereditary characters is due and which ac- 

 ta I c dfedT' t° "? migratC thr ° U « h *e whole organ- 

 ism, are called by him " pangens " (Pano-ene) Thouo-h 



dJubTmakeVet f "?' ° f ?*?*'™ ia ^ ™"' 3XS 



onendweu ? *-*!*** S ram ™tical reader stand 



and exoi^ss i M P '* mth ?^.^P^ because it is short 

 anct expiessive. Moreover, its illegitimate origin will guard 



%"?A b n ng misunder «tood, as the term gemm de was 



at onetime SdS* - V'T **& ° hs ^ d < ol hers have 



we will follow ivf er ' !■ !?• S ° 1Ve the Same P roblem < * nd 

 potheses m dlSCUSsion of th ^e several hy- 



theTi'ewtlfd^T^^fK iS e ? edal]v characterized by 

 me view that the material basis of heredity is to be tumaht 



Phsm Now v^ m °! eCUleS WhiGh COnsti u « *inl So 

 wi be expl Ined S b: r H ain *? in , theend the laws ° f tffi ty 



:;-hicn%i;r;ttrnc um v! iat ? £•& *-&* 

 - Kibiet ss t e fe::™7 is d !; e ' are 



themselves. There is no fhVnr g ' g a " d ° f re P r oducing 

 plain from a pure v chemicalooim T*"* **?* ° an eX " 

 making use ofthelnown propStiW^m' 911 ? "T*^ 

 these wonderful phenomen- 1 P T Z of chem,ca J molecules, 



aa=»fc£a=5S£sS 



