FIELD T-Z 

 Columns 58, 59, 60, and 61 



282 Organ shape. (Use only with Symbol 6 



of Field T-1. ) 



283 Organ growth. (If the rate of growth is 



the aspect affected, use Symbol 2831. ) 

 2831 Rate of growth of the organ 



284 Organ formation from undifferentiated 



tissues 



29 Molting; metamorphosis; the process of 



an individual's change from any juvenile 

 stage to another or to the adult. 

 Consult the Key. 



291 Ecdysis 



2A Organism development, growth, size; 



(multicellular organisms only; for 

 growth of individuals of unicellular 

 Protozoa, Fungi, etc. , use symbols of 

 series 22--; for growth of the mass or 

 colony of individuals of a unicellular 

 organism, use a symbol of the 17-- or 

 18-- series). Use Symbol 2A only when 

 the data do not clearly indicate whether 

 it is the development (structural organi- 

 zation during growth, 2A2) or growth (in- 

 crease in size in terms of linear measure 

 or mass, 2A1; weight, 2A11 ; etc. ) that 

 is affected. 



2A1 Organism size (mass) and form; ultimate 



normal dimensions and shape 



2A11 Organism weight 



2A12 Organism surface area 



2A13 Organism volume 



2A14 Organism shape, normal proportions 



2A2 Organism development (structural 



organization during growth, disregarding 

 increase in mass) 



2A3 Organism growth process; increase in 



mass in normal proportions 



2A4 Regional growth of the entire plant ; 



growth of specific anatomical areas of 

 the plant. For plant growth expressed 

 as weight, volume, etc. , use symbols 

 of series 2A1 -. 



2A41 Terminal growth of the entire plant (as 

 opposed to lateral growth. Symbol 

 2A42). The "terminal" part includes 

 all structures (leaf, stem, flower) at 

 the apex of the plant and does not refer 

 to any one of these parts such as 

 terminal leaf; however. Symbol 2A41 

 can be used for coding terminal growth 

 of the primary "stem" or "trunk". Use 

 Field T-1 Symbol 1, 2, 3, etc. 



2A42 Lateral growth of the entire plant (as 

 opposed to terminal growth, Symbol 

 2A41). The "lateral" part includes all 

 structures (leaf, branch, flower) 

 growing below the apical region of the 

 entire plant. Use Field T-1 Symbol 1, 

 2, 3, etc. 



2B 



2C 



2D 



2D1 



2D2 



2E 

 2F 



2G 



31 



311 



312 



Maturing process of the organism; 

 assumption of the mature adult charac- 

 teristics, in animals and annual and 

 biennial plants usually associated with 

 maturing of reproductive organs, but in 

 perennial plant individuals, it is more 

 a matter of age and size limitations 

 imposed by genetic constitution. For 

 certain organisms (certain arthropods 

 and amphibia), maturing may be coded 

 by Symbol 29, if expressed specifically 

 as "metamorphosis". 



Aging; the process of degeneration of 

 both reproductive and somatic parts 

 and activities, following maturation 

 of the individual multicellular organism, 

 ending in death. 



Inactive state, unspecified 



Dormancy, hibernation, estivation 



Diapause. (This term refers only to 

 arrests of insect development. ) 



Hatching process 



Blooming process . Use Symbol 2F for 

 the normal opening and functioning of 

 the flower or flower crop of a plant. 

 (Use a symbol of the 28-- series for 

 the general development of the flower 

 as an organ [size, weight, etc. ] and 

 symbol F924, FA24, or 416 for color 

 of the flower. ) 



Excystment process. Use Symbol 2G 

 for successful emergence from a pro- 

 tective coating, the cyst wall or cap- 

 sule, of a quiescent stage (described 

 as the "cyst" stage of certain organ- 

 isms), at the beginning of a new active 

 stage. Do not use Symbol 2G for the 

 emergence of insects from the pupa 

 case which would be more appropriately 

 an Item under the 29-- series. 



Genetic change, unspecified. Symbols 



of the 3 series are concerned with 



modification of the material or struc- 

 tures of cells which are genetic deter- 

 miners, chromatin, chromosomes, genes. 

 Included are (a) the specific modifi- 

 cations, (b) the normal incidence of 

 these modifications, and (c) specific 

 changes in the anatomy or physiology 

 of the organism (for which a chromo- 

 some is the determiner) due to a known 

 modification of the chromosome or gene. 



Structural change of the cellular elements 

 which are determiners for the organism's 

 characteristic structure and physiology. 



Polyploidy, haploidy 



Chromosome modification, unspecified, 

 involving the normal number of chromo- 

 somes 



149 - 



