The total was approximately 2800, but that is probably only a vague  he undoubtedly missed some; some have sprung up since his time (modern Hebrew, for instance); and some have vanished.
( ( ( ( ( ( ( ( ( ( ( The total ) ( was ( approximately 2800 ) ) ) , ) but ) ( that ( ( is probably ) ( ( only ( a vague ) ) ( he ( undoubtedly ( missed some ) ) ) ) ) ) ) ; ) ( some ( have ( ( sprung up ) ( since ( ( his time ) ( -LRB- ( ( ( ( modern Hebrew ) , ) ( for instance ) ) -RRB- ) ) ) ) ) ) ) ) ; ) and ) ( some ( have vanished ) ) ) . )
(ROOT (S (S (NP (DT The) (NN total)) (VP (VBD was) (NP (QP (RB approximately) (CD 2800))))) (, ,) (CC but) (S (NP (DT that)) (VP (VBZ is) (ADVP (RB probably)) (NP (NP (RB only) (DT a) (JJ vague)) (SBAR (S (NP (PRP he)) (ADVP (RB undoubtedly)) (VP (VBD missed) (NP (DT some)))))))) (: ;) (S (NP (DT some)) (VP (VBP have) (VP (VBN sprung) (PRT (RP up)) (PP (IN since) (NP (NP (PRP$ his) (NN time)) (PRN (-LRB- -LRB-) (NP (NP (JJ modern) (NNP Hebrew)) (, ,) (PP (IN for) (NP (NN instance)))) (-RRB- -RRB-))))))) (: ;) (CC and) (S (NP (DT some)) (VP (VBP have) (VP (VBN vanished)))) (. .)))
He missed none. 
( He ( ( missed none ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD missed) (NP (NN none))) (. .)))